Here we will talk about:• What is puberty?• When changes happen to boys? • What are the sex organs?• What are erections and why do they happen?

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What’s Happening?

What is Puberty?• It is the time when our bodies change toward an

adult body.– Start to develop new feelings

and interests– Start to make sperm cells

– Or start to make egg cells

What is Puberty?

We will talk about the changes that happen that others can see

And changes that are private

When we talk about these things IT IS NORMAL to feel

ComfortableCurious

Embarrassed

Disgust

ExcitedShy

When do changes happen?– anywhere between 8 and 17– most people begin between the ages of 10 and

14– when you start makes no difference to how

you develop– no age is better any other one

When do changes happen?

• For some, most of the changes happen in a few years

• For some, changes happen slowly over lots of years

THIS IS NORMAL

What changes happen to boys?• Grow taller and heavier • Bones grow bigger and heavier• Nose and jaw get bigger and face

gets longer• Get more muscles • Hair and skin can become oily and

you may get pimples• Body sweats more• Hair grows on the face, under the

armpits, around the genitals (pubic hair).

What changes happen to boys?• May get more hair on arms, legs and

chest. • Voice gets deeper• Penis and testicles grow• Scrotum changes • May have mood swings, sexual

thoughts and feelings • Breasts may grow

What causes these changes?• Hormones – chemical messengers that travel in the

blood stream from the place where they are made (called glands) to the place where they do their work

• Each hormone has a specific job• The pituitary gland, deep inside your brain, gets things

started. It sends out hormones to our sex organs to get them to start making sex hormones

What causes these changes?• It is the sex hormones that make the changes that cause

children’s bodies grow into adult bodies. • Both boys and girls make the same sex hormones. The

main ones are testosterone and estrogen• Boys make lots of testosterone, not so much estrogen • Girls make lots of estrogen, not so much testosterone

What causes these changes?

What will I look like when I grow up?• That depends mostly on your HEREDITY, the GENES you got when an egg cell

and a sperm cell from your birth parents came together to make the cells that developed into you

What will I look like when I grow up?• Genes mostly determine how tall you will grow, the colour of your hair, the size

and shape of your penis or breasts and your overall body shape.• Other things that affect our body are the foods we eat, how active we are and

how much sleep we get.

What are the sex organs?These parts are also called the reproductive organs and genitals

Urethra

Penis

Testicles or Testes

Scrotum

The parts are:

What are the sex organs? Urethra

- the tube through which urine and semen leaves the boy’s body

Penis - tube-like organ that hangs outside the body- come in all sizes and shapes, determined by our

genes

Testicles or testes- usually two, one hangs lower- Sometimes called balls or nuts- Where sperm are made

Scrotum- bag of skin that holds testicles- keeps them at right temperature to make sperm,

slightly cooler than body’s temperature- gets bigger and baggier and turns a darker colour

What happens on the inside?• Hormones from the pituitary make the testicles grow and

they start making more testosterone and producing sperm

• After puberty you make 200,000 - 400,000 sperm cells a day for the rest of your life

• Sperm build up in tubes around the testicles– They travel along some tubes and mix with fluids from glands

What happens on the inside?

• Sperm + fluids = semen

How does the semen come out?• If semen is going to come

out, the penis is likely to be erect

• A penis gets erect when blood rushes into it

• Muscles push the semen into the urethra and out the penis

• This is called an ejaculation.

What can cause an erection?• Boys get erections for all kinds of reasons – they might

happen if you :– Are thinking about something sexy– When you wake in the morning and have to pee– When you are relaxed – When you are anxious or frightened – For no reason at all

What can cause an erection?

• Boys get their first erections before they are born!

When does ejaculation happen?• If a boy wakes up and finds a wet, sticky spot on his

bedclothes semen came out when he was sleeping. This is called a “wet dream”

• If a boy touches or rubs his penis and it gets erect and semen comes out. This is called masturbation.

• Some boys have wet dreams, some don’t • Some boys masturbate, some don’t• However it happens is okay

Does penis size matter?• Testicles grow first so your penis may look as if it is shrinking.• It isn’t• It can take a while for your penis to grow.• Penises, like noses and ears and hands, come in all sizes and

shapes and colours. They vary how they curve and stick out when erect.

• Penises, when erect, are more alike in size than when they are soft.

• They all work.

So what are normal feelings?• Some guys think about girls and kissing and touching • Some guys think about other guys and kissing and

touching• Some guys don’t think about any of this stuff• Some have crushes and fall in love • Some don’t • Some get angry at parents

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